Bayer and Co.
Patent: DE266656 ;
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Bayer and Co.
Patent: DE254714 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 11, p. 783
Cliffe
Journal of the Chemical Society, 1933 , p. 1327
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Knoevenagel
Chemische Berichte, 1921 , vol. 54, p. 1726;
Chemische Berichte, 1923 , vol. 56, p. 2416